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  <title>使用 HMAC 方法生成带有密钥的哈希值</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.hash-hmac" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">hash_hmac</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.1.2, PHP 7, PECL hash &gt;= 1.1)</p><p class="refpurpose"><span class="refname">hash_hmac</span> &mdash; <span class="dc-title">使用 HMAC 方法生成带有密钥的哈希值</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.hash-hmac-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>hash_hmac</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$algo</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$raw_output</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
  ] ) : <span class="type">string</span></div>


 </div>

 <div class="refsect1 parameters" id="refsect1-function.hash-hmac-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">algo</code></dt>

     <dd>

      <p class="para">
       要使用的哈希算法名称，例如：&quot;md5&quot;，&quot;sha256&quot;，&quot;haval160,4&quot; 等。
       如何获取受支持的算法清单，请参见 <span class="function"><a href="hash_hmac_algos.html" class="function">hash_hmac_algos()</a></span> 函数。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">data</code></dt>

     <dd>

      <p class="para">
       要进行哈希运算的消息。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">key</code></dt>

     <dd>

      <p class="para">
       使用 HMAC 生成信息摘要时所使用的密钥。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">raw_output</code></dt>

     <dd>

      <p class="para">
       设置为 <strong><code>TRUE</code></strong> 输出原始二进制数据，
       设置为 <strong><code>FALSE</code></strong> 输出小写 16 进制字符串。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.hash-hmac-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   如果 <code class="parameter">raw_output</code> 设置为 <strong><code>TRUE</code></strong>， 则返回原始二进制数据表示的信息摘要，
   否则返回 16 进制小写字符串格式表示的信息摘要。
   如果 <code class="parameter">algo</code> 参数指定的不是受支持的算法，返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.hash-hmac-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>7.2.0</td>
       <td>不再支持非加密的哈希函数（adler32，crc32，crc32b，fnv132，fnv1a32，fnv164，fnv1a64，joaat）。</td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-function.hash-hmac-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-896">
    <p><strong>Example #1 <span class="function"><strong>hash_hmac()</strong></span> 例程</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">hash_hmac</span><span style="color: #007700">(</span><span style="color: #DD0000">'ripemd160'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'The&nbsp;quick&nbsp;brown&nbsp;fox&nbsp;jumped&nbsp;over&nbsp;the&nbsp;lazy&nbsp;dog.'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'secret'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
b8e7ae12510bdfb1812e463a7f086122cf37e4f7
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.hash-hmac-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="hash.html" class="function" rel="rdfs-seeAlso">hash()</a> - 生成哈希值 （消息摘要）</span></li>
    <li class="member"><span class="function"><a href="hash_hmac_algos.html" class="function" rel="rdfs-seeAlso">hash_hmac_algos()</a> - Return a list of registered hashing algorithms suitable for hash_hmac</span></li>
    <li class="member"><span class="function"><a href="hash_init.html" class="function" rel="rdfs-seeAlso">hash_init()</a> - 初始化增量哈希运算上下文</span></li>
    <li class="member"><span class="function"><a href="hash_hmac_file.html" class="function" rel="rdfs-seeAlso">hash_hmac_file()</a> - 使用 HMAC 方法和给定文件的内容生成带密钥的哈希值</span></li>
   </ul>
  </p>
 </div>


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